Monster Manual
series of core books for D&D

The Monster Manual (MM) is the primary bestiary sourcebook for monsters in the Dungeons & Dragons (D&D) fantasy role-playing game, first published in 1977 by TSR. The Monster Manual was the first hardcover D&D book and includes monsters derived from mythology and folklore, as well as creatures created specifically for D&D. Creature descriptions include game-specific statistics (such as the monster's level or number of hit dice), a brief description of its habits and habitats, and typically an image of the creature. Along with the Player's Handbook and Dungeon Master's Guide, the Monster Manual is one of the three "core rulebooks" in most editions of the D&D game. As such, new editions of the Monster Manual have been released for each edition of D&D. Due to the level of detail and illustration included in the 1977 release, the book was cited as a pivotal example of a new style of wargame books. Future editions would draw on various sources and act as a compendium of published monsters.
Early Dungeons & Dragons
The first D&D boxed set did not have a separate Monster Manual but provided listings for monsters in Book 2: Monsters and Treasure, one of the included booklets. After the series was separated into basic and advanced games, the basic game continued to be published in level-based boxes. Monsters of the appropriate level were included in the rulebooks for the various basic game sets (the Basic, Expert, Companion, Master, and Immortal sets). These monsters were later collected in the Rules Cyclopedia, which replaced the higher-level boxed sets, and the Creature Catalogue.
Creative origins
Games scholar Jaroslav Švelch saw the Monster Manual modeled after "medieval bestiaries, only with more precise figures": "Whereas medieval bestiaries attempted to situate unknown creatures within what was the known system of nature, games like Dungeons & Dragons created simulated natures of their own and populated them with creatures that followed their artificial laws and conditions."
Advanced Dungeons & Dragons
Original Monster Manual
The first publication bearing the title Monster Manual was written by Gary Gygax and published in 1977 as a 108-page book. It was the first hardcover book for any D&D game and the first of the core manuals published for the new Advanced Dungeons & Dragons (AD&D) version of the game.
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